Beef carbonnade

First, preheat the oven to 180 degrees. Brown beef chunks (1kg) with butter and olive oil. Remove from the pan. Cook 2 sliced onions, and 2 crushed garlic cloves at medium heat for 4 minutes. Add 2 tbsp of plain flour, stir well and cook for 1 minute. Combine 1 1/2 cups of brown ale with 1 1/2 cup of water and add to the pan. Stir well, bring to the boil and return the meat to the pan. Add bouquet garni, season with salt and pepper, and return to the boil. Transfer to a casserole dish, cover well with foil and cook in the oven for 2 1/2 hours. Spread French bread slices with dijon mustard and butter. Place bread on stew, and cook uncovered for 20 minutes until the bread becomes crusty.